<?php

$a1 = a;
$a2 = b;
$a3 = c;
$a4 = d;
$a5 = e;
$a6 = f;
$a7 = g;
$a8 = h;
$a9 = i;
$a10 = j;
$a11 = k;
$a12 = l;
$a13 = m;
echo $a1.$a2.$a3.$a4.$a5.$a6;
echo $a1.$a2.$a3.$a4.$a5.$a6.$a7;
echo $a1.$a2.$a3.$a4.$a5.$a6.$a7.$a8;
echo $a1.$a2.$a3.$a4.$a5.$a6.$a7.$a8.$a9;
echo $a1.$a2.$a3.$a4.$a5.$a6.$a7.$a8.$a9.$a10;
echo $a1.$a2.$a3.$a4.$a5.$a6.$a7.$a8.$a9.$a10.$a11;
echo $a1.$a2.$a3.$a4.$a5.$a6.$a7.$a8.$a9.$a10.$a11.$a12;
echo $a1.$a2.$a3.$a4.$a5.$a6.$a7.$a8.$a9.$a10.$a11.$a12.$a13;
